package com.sixiaolong.filter;

import com.alibaba.fastjson.JSON;
import com.sixiaolong.common.BaseContext;
import com.sixiaolong.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否已经完成登录
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
//    路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        long id = Thread.currentThread().getId();
        log.info("过滤器的线程id为："+id);
//        1:获取本次请求的URI
        String uri = request.getRequestURI();
//        2:判断本次请求是否需要处理  静态资源和登录登出都不需要处理
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login", //移动端登录
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        boolean check = check(urls, uri);
//        对不需要处理的请求进行放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }
//       4.1 判断登录状态  已经登录的进行放行  有没有session
        if (request.getSession().getAttribute("employee") != null) {
//            获取id  并存放在threadlocal中
            Long empid = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empid);
            filterChain.doFilter(request,response);
            return;
        }

//       4.2 判断登录状态  已经登录的进行放行  有没有session
        if (request.getSession().getAttribute("user") != null) {
//            获取id  并存放在threadlocal中
            Long userid = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userid);
            filterChain.doFilter(request,response);
            return;
        }
        //        如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
//        log.info("拦截到请求："+request.getRequestURI());
    }
    //    路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) return true;
        }
        return false;
    }
}

